typhoon/docs/architecture/azure.md

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# Azure
## Load Balancing
![Load Balancing](/img/typhoon-azure-load-balancing.png)
### kube-apiserver
A load balancer distributes IPv4 TCP/6443 traffic across a backend address pool of controllers with a healthy `kube-apiserver`. Clusters with multiple controllers use an availability set with 2 fault domains to tolerate hardware failures within Azure.
### HTTP/HTTPS Ingress
A load balancer distributes IPv4 TCP/80 and TCP/443 traffic across a backend address pool of workers with a healthy Ingress controller.
The Azure LB IPv4 address is output as `ingress_static_ipv4` for use in DNS A records. See [Ingress on Azure](/addons/ingress/#azure).
### TCP/UDP Services
Load balance TCP/UDP applications by adding rules to the Azure LB (output). A rule may map different ports (e.g. 3333 external, 30333 internal).
```tf
# Forward traffic to the worker backend address pool
resource "azurerm_lb_rule" "some-app-tcp" {
resource_group_name = module.ramius.resource_group_name
name = "some-app-tcp"
loadbalancer_id = module.ramius.loadbalancer_id
frontend_ip_configuration_name = "ingress"
protocol = "Tcp"
frontend_port = 3333
backend_port = 30333
backend_address_pool_id = module.ramius.backend_address_pool_id
probe_id = azurerm_lb_probe.some-app.id
}
# Health check some-app
resource "azurerm_lb_probe" "some-app" {
resource_group_name = module.ramius.resource_group_name
name = "some-app"
loadbalancer_id = module.ramius.loadbalancer_id
protocol = "Tcp"
port = 30333
}
```
## Firewalls
Add firewall rules to the worker security group.
```tf
resource "azurerm_network_security_rule" "some-app" {
resource_group_name = "${module.ramius.resource_group_name}"
name = "some-app"
network_security_group_name = module.ramius.worker_security_group_name
priority = "3001"
access = "Allow"
direction = "Inbound"
protocol = "Tcp"
source_port_range = "*"
destination_port_range = "30333"
source_address_prefix = "*"
destination_address_prefix = module.ramius.worker_address_prefix
}
```
## IPv6
Azure does not provide public IPv6 addresses at the standard SKU.
| IPv6 Feature | Supported |
|-------------------------|-----------|
| Node IPv6 address | No |
| Node Outbound IPv6 | No |
| Kubernetes Ingress IPv6 | No |